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I added a perforated baffle above the burner and modified the sloping baffle on the bottom of the RC. I tried another roast and it was successful.

I still had some beans getting scorched/burning. I believe they are getting stuck under the temperature probe and when I was adjusting the fan control. I removed the probe and I'm getting used to riding the fan speed control. I will probably drill a hole above the lower flange in the site glass RC assembly.

I had to add a second plate on the bottom to prevent the air pressure from bending up the sloped plate and making it too hot. There is scorching evident on the sloping plate from my first test and the reason I added a baffle below the perf plate.

The baffle plate:


The bottom of the perf plate:


The top of the perf plate: